Final answer:
The driver of a school bus will flash red lights before stopping to load passengers, which alerts other drivers to slow down and prepare to stop for the safety of boarding students.
Step-by-step explanation:
Before a school bus stops to load passengers, the driver will usually flash red lights. These lights are used to alert other drivers that the bus is stopping to allow students to board or disembark, providing a warning to drivers to slow down and prepare to stop. Pedestrian safety around school zones is particularly important, and flashing red lights on a school bus help to prevent accidents by commanding attention and ensuring that drivers heed the bus's upcoming stop. This contributes to safer crossing for students and helps to manage vehicle speeds in these areas.